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From |
Marta García-Granero <mgarciagranero@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
st: Re: Need help with agriculture split-plot (not Kirk's definition) - got it |

Date |
Mon, 18 Feb 2013 18:15:37 +0100 |

(ashamed) Sorry, I found out for myself, I had forgotten the dash (/): anova chloro blocks nitrogen/blocks#nitrogen years nitrogen#years Did the trick "plots" was not needed, after all. So much to learn yet... Regards, Marta El 18/02/2013 18:00, Marta García-Granero escribió:

Hi:I am badly stuck trying to translate some SPSS syntax to Stata. I amtrying to set the ANOVA model for an agriculture split-plot, asdescribed in Kuehl's "Design of Experiments" 2nd ed., chapter 14, withdifferent error terms for blocks & whole plots factor (error 1), andsub-plot factor & interaction (error 2).The closest I got to Table 14.3 is this: plots blocks nitrogen years chloro 1 1 1 1 3.8 1 1 1 2 5.3 1 1 1 3 5.9 2 2 1 1 3.9 2 2 1 2 5.4 2 2 1 3 4.3 3 1 2 1 5.2 3 1 2 2 5.6 3 1 2 3 5.4 4 2 2 1 6.0 4 2 2 2 6.1 4 2 2 3 6.2 5 1 3 1 6.0 5 1 3 2 5.6 5 1 3 3 7.8 6 2 3 1 7.0 6 2 3 2 6.4 6 2 3 3 7.8 7 1 4 1 6.8 7 1 4 2 8.6 7 1 4 3 8.5 8 2 4 1 7.9 8 2 4 2 8.6 8 2 4 3 8.4 insheet using "kuehlCh14splitplot", double tab label define source 1 "ureic" 2 "ammonium" 3 "IBDU" 4 "ureic(S)" label values nitrogen source label define time 1 "2 years" 2 "5 years" 3 "8 years" label values years time anova chloro blocks nitrogen years nitrogen#years plots|blocks#nitrogenThis used to work with SPSS, since it automatically sets as error termfor a given factor any term nested inside it.The SS, df & MS are correct, but I don't know how to force that the Fvalues for blocks and nitrogen are computed usingplots|blocks#nitrogenas error term.My ANOVA table: Number of obs = 24 R-squared = 0.9648Root MSE = .463231 Adj R-squared= 0.8988Source | Partial SS df MS F Prob > F----------------------+----------------------------------------------------Model | 47.0629167 15 3.13752778 14.62 0.0003 | blocks | .510416667 1 .510416667 2.38 0.1616 nitrogen | 37.3245833 3 12.4415278 57.98 0.0000 years | 3.81583333 2 1.90791667 8.89 0.0093 nitrogen#years | 4.15416667 6 .692361111 3.23 0.0646 plots|blocks#nitrogen | 1.25791667 3 .419305556 1.95 0.1996 | Residual | 1.71666667 8 .214583333----------------------+----------------------------------------------------Total | 48.7795833 23 2.12085145 My goal: Number of obs = 24 R-squared = 0.9648Root MSE = .463231 Adj R-squared= 0.8988Source | Partial SS df MS F Prob > F----------------------+----------------------------------------------------Model | 47.0629167 15 3.13752778 | blocks | .510416667 1 .510416667 0.510/0.419=1.218nitrogen | 37.3245833 3 12.441527812.442/0.419=29.69years | 3.81583333 2 1.90791667 8.89 0.0093OKnitrogen#years | 4.15416667 6 .692361111 3.230.0646 OKplots|blocks#nitrogen | 1.25791667 3 .419305556 --> Thisshould be Error for blocks&nitrogen| Residual | 1.71666667 8 .214583333----------------------+----------------------------------------------------Total | 48.7795833 23 2.12085145 Any clues? Thanks in advance, Marta GG

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